Lock



VI. A. MUELLER LOCK Filed July 24 INVENTOR.

A TTORNE YJ I Jan. 8 3924 I \N. A. MUELLER LOCK Filed July 24. 1920 3Sheets-Sheet 2 4 fifzzelkerv I N V EN TOR.

Q MADZ I Q d u/y .4 TTORNEYS Patented Jan. 8, 1924.

UNITED STATES WILLIAM A. MUELLER, OF WASHINGTON, DISTRICT OF COLUMBIA.

LOCK.

Application filed July 24, 1920. Serial No. 398,621.

To all whom it may concern:

Be it known that I, WILLIAM A. MUELLER, citizen of the United States,1'esidingat Washington, District of Columbia, have invented certain newand useful Improvements in Locks, of which the following is aspecification.

The object of this invention is to provide a door lock which will beburglar-proof, which may be operated from either side of thedoor byauthorized persons and which may be so set that, it cannot be operatedfrom the outside of the door even by the application of a key which mayproperly fit. The invention seeks to provide a lock having the statedcharacteristics which will comprise a plurality of bolts simultaneouslyoperated and also comprise a tumbler actuated by the bolt-operatingmeans to engage one of the bolts and hold them in a set position. Theinvention further seeks to provide a lock having the describedcharacteristics which will be inexpensive to construct, readily appliedto a door and compact so as to occupy but very little space upon thedoor. and other objects which will incidentally appear in the course ofthe following description are attained in the mechanism illustrated inthe accompanying drawings and the invention resides in certain novelfeatures which will be particularly pointed out in the appended claims.

In the drawings Figure 1 is a perspective view of my improved lock inits operative position and showing it adjusted to permit its operation;

Fig. 2 is an elevation of the lock viewed from the side which is appliedto the door;

Fig. 3 is an elevation with the face plate.

removed showing the bolts withdrawn and the tumbler in positicfir topermit the projection of the bolts;

Fig. 4 is a similar view showing the bolts projected and locked againstwithdrawal by the tumbler;

Fig. 5 is a transverse section on the line 55 of Fig. 4;

Fig. 6 is a detail perspective view of the keeper;

Fig. 7 is a group perspective view of two of the bolts and the tumbler;

Fig. 8 is a horizontal section through the lock and a portion of thedoor and door frame.

The door 1 may be of any well-known The several stated objects,

form mounted to swing in a horizontal plane but the door jamb 2 in theapplication of my invention is obstructed with-a rabbet, as shown at 3,whereby when the door is closed the jamb will project over the outerside of the door beyong the free edge thereof to resist the insertion ofa jimmy or other forcing tool. To the inner corner of the jamb, I securethe keeper 4 which is constructed with a wing or lip 5 seating in theedge of the door jamb, as clearly shown in Fig. 8. The said wingobviously extends at a right angle to the main portion of the keeper andthe back of .the keeper is also seated in a mortise provided therefor inthe door jamb, as clearly shown in Fig. 8. A second wing or lip 6projects forwardly from the main plate of the keeper and this forwardlyprojecting wing is provided with a vertical slot 7 which receives theend of a horizontal bolt as will be presently more fully set forth. Atthe upper and lower ends of the keeper are forwardly projecting lugs 8which are integral with the main portion of the keeper and the wing 6and are each provided with a slot 9 extending vertically therethrough toreceive the ends of bolts.

The lock comprises a casing 10 which is 'secured upon the inner side ofthe door in such position that one end thereof will project beyond theedge of the door and fit between the lugs 8 of the keeper and againstthe wing 6 thereof, as clearly shown in Figs.

1 and 8. This lock case comprises a shell which encloses the bolts andoperating parts and a face plate 11 which fits within one side of theshell and is disposed against the door when the lock is applied. Theface plate is secured to the look by a screw 12 inserted therethroughinto a suitable opening in the shell and a cam or lever 13 has its stemor shaft 14 journaled in the said plate 11 and reinforced and sustainedagainst endwise movement by a collar or boss 15 fitted around itsprojecting end. In the-extremity of the stem 14, I provide a slotornotch 16 which is engaged by a tongue 17 carried by the inner end of abarrel 18 forming the working member of an ordinary barrel lock 19fitted in the door from the outer side thereof. This lock 19 is held inthe chamber provided therefor in the door by bolts 20 inserted through abacking plate or escutcheon 21 and engaging lugs 22 on the casing of thelook, as shown in Fig. 8. The

- being provided at its extremity with a cir-- internal mechanism of thebarrel lock forms no part of my invention and may be of any well-knowntype, the lock beingvillustrated in elevation only and more detaileddescription is deemed unnecessary.

That end of the lock casing which fits and having its outer endsupported by the opening 24 in the end of the case and its inner endsupported and guided b ribs or lugs 25 formed on the inner side of thecase at the inner end thereof. The extremity or head 26 of the bolt isreduced vertically but enlarged laterally relative to the main body ofthe bolt so as to provide shoulders 27' which are adapted to abut theend wall of the lock case and thereby limit the extent to which the boltmay be projected and, as

a result, prevent the working. parts becoming jammed. At the inner endof the bolt and at about the center thereof are, crossheads 28 and 29which present shoulders or abutments against which the cam or lever 13ma ride when the door is to be locked or un ocked from the outside, andalso present similar shoulders or abutments upon which a cam or lever 30may ride when the door is to be locked or unlocked from the inside. Theweb 31 connecting the crossheads 28 and 29 may be of the same thicknessas the main portion 23 of the bolt but is preferably of less extentvertically so as to avoid the liability of interference with theassembling or operation of either operating member as will be readilyunderstood. The cam or lever 30 is formed on or secured to the inner endof a stem or shank 32 which is equipped at its outer end with a knob 33which is preferably provided with a milled or corrugated periphery sothat it may be readily and firmly grasped.

Upon one side of the bolt 23 adjacent the crosshead 29 is a lateral stud34 upon which is loosely fitted the shorter arm 35 of an angle leverwhich is fulcrumed upon a pin or stud 36 formed on the inner side of thelock case.- The said arm 35 is provided with an elliptical opening 37which receives the stud 34 and accommodates the relative angularmovement of the lever and the bolt when the lock is operated. The longerarm 38 of the angle lever extends within thelock case approximatelyparallel with the bolt 23 and toward the head 26 of said bolt,

cular enlargement or head 39 connected with themain portion of the armby a reduced neck 40. The vertically movable bolt coin- Lesoner prises alocking head 41 which is disposed vertically within the casing and isadapted to play through the opening provided therefor in the top orbottom of the same. This locking head 41 is connected by a web 42 withan inwardly projecting arm 43 pro vided on one side with a roove 44adapted to slidably engage a guic ing rib 45 on the lock case so thatthe head 41 will be caused to move in a rectilinear vertical path, itbeing noted upon reference to Figs. 3 and 4 of the drawings that thesaid head fits closely between the said rib 45 and the end of the lockcase but may move freely in the operation of the lock. The arm 43.isprovided with a circular opening 46 in which the head 39 of the anglelever fits and is also provided with a notch or slot 47 to accommodatethe reduced neck 40. The described angle lever and vertically movablebolt are duplicated as clearly shown in Figs. 3 and 4, one bolt andlever being provided above the plane of the horizontally moving bolt 23and the other bolt and angle lever being disposed below said plane, bothangle levers being operatively engaged .upon the pin or stud 34, asshown and as will be readily understood. It is thought to be clear thathorizontah movement imparted to the bolt 23 will cause the angle leversto swing about their re spective fulcrums and consequently impartvertical movement to the ends of their longer arms which movement istransmitted directly to the bolts cooperating therewith so that thethree bolts will be simultaneously projected or withdrawn. A spring 48is secured at the inner end of the lock case and has its free endarranged to bear upon the hub 49 of the cam or lever 30 so that it willact as a brake to hold the said cam or lever in the position to which itmay be moved and thereby prevent shifting of the sameto a-position inwhich it will not properly perform its allotted functions.

Upon reference to Fig. 7, it will be noted that the crosshead 29 isreduced on its side facing the stud 34, as shown at 50, so'that a recessis provided between the said side of the crosshead and the adjacent endofthe main body of the bolt 23. A notch 51 of similar form is providedin the upper edge of the bolt immediately adjacent the groove or notch50 and either of these notches may be engaged by the tumbler accordinglyas the bolt is projected or withdrawn. The

tumbler 52 is disposed within the case above the web 31 of the bolt andconsists of a block provided on its'under side at one end with a tooth53 adapted to engage'the notch 50 or the notch 51 and further providedintermediate its ends with the depending lugs 54 adapted to pass onopposite sides of the web 31 and thereby serve to maintain the operativerelation of the tumbler and the bolt. These lugs also constitutestrikers against which the cam 13 or the cam 30 may impinge so as tolift the tumbler from its engagement with the bolt when the bolt is tobe shifted. Upon one side, the tumbler is provided with the spacedvertical shoulders 55 which fit closely but slidably between and againstthe guide ribs 56 on the lock casing so that the tumbler will be held inits movement to a true rectilinear path. A pin 57 rises from the tumblerthrough the upper side of the lock case and a spring 58 is coiled aroundthe said pin between the tumbler and the top of the case so that by itsexpansion it will normally force the tumbler to the bolt. The pin 57 isof such length or so adjusted in the tumbler that when the tumbler is inits operative position, shown in Fig. 4-, the upper extremity of the pinwill be flush with or below the top surface of the lock casing, and uponthe top of the lock case I pivotally mount the latch 59 which mayconveniently be a small plate provided with a thumb piece 60, whereby itmay be easily manipulated, and having a notch 61in one edge adapted toengage a headed stud 62 on the lock case adjacent the opening throughwhich the pin 57 plays whereby when the dead latch is swung intoengagement with said headed stud it will cover the end of the pin 57 andthereby prevent'movement of the pin and the tumbler.

It is thought the operation of the lock will be readily understood fromthe foregoing description, taken in connection with the accompanyingdrawings. When the door is closed, as shown more clearly in Fig. 8 theedge of the door will be covered by the rabbeted portion of the doorjamb and the lock case will project beyond the edge of the door so as tobridge the inner end of the joint or space between the door and thejamb. It will thus be seen that forcing of the door by evil disposedpersons will be prevented inasmuch as even if the projecting' portion ofthe rabbeted j amb should be cut-ofi the insertion of a tool betweenthedoor and the door frame so as to force the lock would be preventedinasmuch as even if the end of the tool should reach to the inner sideof the door it would strike against the side of the lock casingand'could not enter between the same and the keeper. Moreover, thekeeper fits around two sides of the door jamb so as to protect the jamband resist efforts to cut-away the same and also furnishes means wherebythe keeper may he very efiectually secured to the jamb inasmuch asfastening screws may be inserted through the outwardly extending Wingthereof as well as through the main portion of the same, as will bereadily understood on reference to Figs. 5 and 8. The

door having been closed, the bolts may be projected from either side ofthe door by manipulating the knob 33 or the lock 19 as the case may be.When either the cam 13 or the cam 30 is moved pivotally the end thereofwill rideagainst and under the adjacent lug 54 of the tumbler and willlift the tumbler against the tension of the spring 58 so that the tooth53 will be released from the bolt. The continued movement of the camwill then bring it into engagement with and cause it to ride upon thecrosshead 28 or the crosshead 29 and move the bolt 23 horizontally, amovement of the end of the cam toward the keeper projecting the boltinto engagement with the keeper so as to lock the door. Simultaneouslywith the movement of the bolt 23, the bolts 41 will be moved intoengagement with the keeper so that the keeper will be engaged upon threesides and the door very securely locked. Of course, movement of the camin the reverse direction will Withdraw the bolts and permit the door tobe opened. The upward movement of the tumbler obviously causes the pin57 to play through the top of the lock case. Therefore, if the latch 59be swung over the pin vertical movement thereof and of the tumbler willbe prevented and the bolts cannot be Withdrawn. It is thus possible toset the lock from the inside of a room so that the door cannot be openedfrom the outside even though the person attempting to open the door besupplied with a key which will fit the barrel lock 19. It is alsopossible for a person occupying the room to set the lock so that thebolts cannot be projected-and thus permit free passage through thedoorway in day light or within authorized hours.

My improved lock is simple in the construction and arrangement of itsparts and may be readily applied to a door and easily manipulated by aperson occupying the room access to or egress from which is ob tainedthrough the doorway. Inasmuch as the lock may be so set that it cannotbe opened even by the insertion of a key. it is obvious that theoccupant of a room is secure against all intrusion.

Having thus described the invention, what is claimed as newis:

1. In a lock, the combination of a keeper having an end extension, alock case adapted to overlap the door jamb and be overlapped by theextension on the keeper, a longitudinally movable bolt mounted in thelock case and adapted to engage the keeper, a vertically movable bolt inthe case adapted to engage the extension of the keeper, an angle leverfulcrumed at its angle upon the case and having a. pin and slotconnection with the first-mentioned bolt, the vertically movable boltbeing provided with a circular opening and a. slot leading from saidopening and v the angle lever being provided at the end of itslongitudinal arm with a head engaging in said opening and a reduced neckextending through said slot, and means acting upon one of the bolts toproject or withdraw the same.

2. In a lock, the combination of a keeper having end extensions, a lockcase adapted to overlap the door jamb and be overlapped by theextensions on the keeper, a horizontally movable bolt mounted in thelock case and adapted to engage the keeper, a vertically movable boltmounted in the lock case to engage an extension of the keeper and havinga laterally extending arm arranged adja cent and parallel with thehorizontalmovable bolt, a lateral stud on the horizontally movable bolt,an angle lever fulcrumed on the lock case adjacent the bolts andprovided witha slot at one end engaging said stud and provided at itsother end with a circular head fitting within a corresponding opening inthe lateral arm of the vertically movable bolt, and means to actuate thebolts.

8. In a lock, the combination of alock case, a bolt slidably mountedtherein, a tumbler mounted adjacent the bolt and adapted to engage thesame to hold it a ainst movement in either direction, a pin ei tendingfrom the tumbler into the top wall of the lock case and adapted toproject beyond the case, yieldable means acting on the tumbler to holdit in engagement with the bolt, means to release the bolt t'rom' thetumbler and actuate the bolt, and a latch mounted on the exterior of thelock case and adapted to extend across the end of the pin projectingfrom the tumbler to prevent movement of the tumbler.

4. in a lock, the combination of a lock case, a bolt mounted therein forsliding movement and provided with spaced vertically disposed shoulderson its sides and with spaced notches in its upper edge in advance ofsaid shoulders, a tumbler mounted in the lock case above the bolt forrectilinear movement-transverse to the bolt, a tooth at one end of thetumbler to engage any of the notches in the bolt, lugs depending fromthe tumbler at the sides of the bolt between the shoulders thereon, camsrotatably mounted in the walls of the lock case at the sides of the boltto engage the respective depending lugs on the tumbler and the shoulderson the bolt whereby to release the tumbler from the bolt and project orretract the latter, and means for operating said cams.

5. The combination of a keeper having end extensions and a lock adaptedto overlap the door jamb and be overlapped by the extensions on thekeeper, the said lock having a main bolt adapted to engage the keeperandtwo bolts at right angles to the main bolt to engage recessed seatsin the said extensions of the keeper, the said two bolts at right anglesto the main bolt being positively actuated in both directions by themovements of the said main bolt.

6. The combination of a keeper having an end extension and a lockadapted to overlap the door jamb and be overlapped at one end by thesaid extension on the keeper, the said lock having a main bolt adaptedto engage the keeper and a supplemental bolt connected directly with andpositively actuated in its two movements by the main bolt and adapted toengage a recessed seat in the extension of the keeper.

In testimony whereof I atlix my signature.

WILLIAM A. [1 s.]

